Do you know why different animals or pests (昆虫) have their special colors? Colors in them seem to be used mainly to protect themselves.

    Some birds like eating locusts (蝗虫), but birds cannot easily catch them. Why? It is because locusts change their colors together with the change of the colors of crops(庄稼). When crops are green, locusts look green. But as the harvest time comes, locusts change to the same brown color as crops have. Some other pests with different colors from plants are easily found and eaten by others. So they have to hide themselves for lives and appear only at night.

    If you study the animal life, you'll find the main use of coloring is to protect themselves. Bears, lions and other animals move quietly through forests. They cannot be easily seen by hunters (猎人). This is because they have the colors much like the trees.

    Have you ever noticed an even stranger act? A kind of fish in the sea can send out a kind of very black liquid (液体)when it faces danger. While the liquid spreads over (散开), its enemies (敌人)cannot find it. And it immediately swims away. So it has lived up to now though it is not strong at all.

    You may know several kinds of police, traffic police and street police. But have you ever heard of energy-saving (节能) police?

    A group of 22 new policemen went to work in Beijing. They went around the city to see the use of energy in hotels, office buildings, shopping centres and other public places. One of their aims is to make sure that these places have set their air conditioners (空调) no cooler than 26℃.

    They also set up a special phone hotline so that people can tell them which building doesn't follow the rule.

    "If everyone sets the air conditioner at 26℃, Beijing will save 400 million kilowatt-hours of electricity in one summer. That's one third of all the usage of the city in the season, said an advertisement."

    A show was held in Beijing last week on energy-saving technology (技术) and productions to introduce a green life to the public. Environmentally—friendly machines, like a machine that helps collect used bottles, have attracted lots of attention.

    "We want to tell people that there are some ways to protect the environment. Each of us can find effective (有效的) ways to do it in our daily life," said Liu Qianguang, an environmental engineer.

Smartphones have become necessary tools in people's lives. We carry them everywhere, take them to bed and to the bathroom. And for many people, after waking up in the morning, what they see first is their smartphones. 

Most worries about phones usually lie in the danger which is caused by using them while driving, or the bad influence they bring to us, such as making us depend on them too much but hardly care about people around us. 

However, have you ever thought about your smartphone may be a factory full of microbes （细菌） and viruses（病毒）. A survey made in 2019 found that most people（57 percent） in the UK use their phones on the toilet. Another study found three in four Americans（74. 5 percent） use their phones on the toilet. We also eat while using our phones and usually put them down on all kinds of dirty surfaces. All of them can transfer microbes onto our phones. And some of the viruses, like the common cold virus, can live on the phone surfaces for almost a week. 

Researchers have shown that people touch their phone hundreds, if not thousands, of times a day. And although many of us often wash our hands after going to the bathroom, cooking, cleaning or gardening, it is almost impossible for us to consider washing our hands after touching our phones. 

As a result, it's not surprising that studies have found our mobile phones are dirtier than toilet seats. Maybe it's time. to think more about keeping mobile phones clean. 

Hopes, ambitions(抱负) dreams. How many of your will you achieve? When you look back at your life in the future, will you have good memories of all the things that you did? Or will you regret all the things that you didn't do?

Of course, there's no easy road to success, but one thing is certain: success won't come if you don't do anything. So how do you do it? This four-step model will help you to make your dreams come true.

Don't let your ambitions die. Follow this four step plan and make your dream come true.

Will you try the four steps plan to make your dream come true? Why or why not? {#blank#}5{#/blank#}

Hello, my name is Linda Brown. Linda is my first name and Brown is my last name. I am an English girl. This is a 1 of my family. You can see 2 people in it. These are my grandparents. They are my father's 3 . They are in the middle of the picture. This is my father. His name is Eric. This is my mother, Grace. She wears a 4  hat. Blue is her favorite color. My parents have four 5 , two sons and two daughters. Dale and Frank are my brothers. Dale is nine. Frank is seven. I am six. Can you see the girl6 a red hat? 7 is my sister, Jenny. She is four.8 that woman on the right? She is my 9 . She's my father's sister. Oh, Kimi is in this photo, too. She's my pet dog. She's my good friend. I love my family and we10 each other. 

Jessie is an eleven-year-old student in Star Primary School (小学). It is a big school with many trees and flowers. There are 220 teachers in it. Sixty classrooms are in the classroom building. And every class has 30 students. 

Here is a map of her school. Let's have a look!

Jessie likes her school very much. But she likes the music classroom best because it is very special. There are some desks in it, but there aren't any chairs. Guess where they sit! They sit on yoga balls. Sitting on yoga balls is so fun. All the students like it very much. In every classroom there are many pictures on the wall and there are many flowers in the front of the classroom. They make the classroom very beautiful.